Ore-mill



PATENIED FEB. 16, 1904,

' W. E, WILD. l

ORE MILL.

APPLICATION FILED Nov. 24, 1902.

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PATENTBD PEB. 16, 1904.

n' W. E. WILD.

ORE MILL.

APPLIGATION HLED Nov. 24 1902.

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Patented February 16, 1904.

UNITED STATES PATENT OEEICE.

WILLIAM E. WILD, OF DENVER, COLORADO.

ORE-MILL.

SPECIFICATION forming part of Letters Patent No. 752,138, dated February 16, 1904.

Application filed November 24, 1902. Serial No. 122,652. (No model.)

To all whom t may concern/:

Be it known that I, WILLIAM E. WILD, a citi- Zen of the United States of America, residing at Denver, in the county of Arapahoe and State of Colorado,have invented certain new and useful Improvements in Ore-Mills; and I do de-` clare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use-the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

This invention relates to improvements in centrifugal roller ore-mills.

The object of the invention is to provide a mill which is designed to receive the ore from the crusher and reduce the same uniformly to the required degree of lineness, but so as to make little or no slimes, the pulp thus produced being in the best condition for concentration. I attain this object by providing a circular mill the bottom of which is provided circumferentially with'a track or die having two grinding-faces which are at an obtuse angle to each other and upon which travel three rolls, each also having two grinding faces which coincide with the faces of the dies, the l said rolls having both a revoluble movement and a circular movement around the mill and being designed to be thrown outward by the centrifugal force of their circular movement, so that their outer faces will reduce the ore between them and the corresponding face of the shoe, while their circumferential faces will reduce the ore beneath them, the weight of the rollers being sufficient for the purpose. The axes of the rolls are at a tangent to the aXis of their circular movement, the purpose of which, together with the various other advantages of the improved mill, will fully appear in the accompanying specification and claim.

In the accompanying drawings, Figure 1 is a plan view of my improved mill. Fig. 2 is a sectional view thereof on the line 2 2 of Fig. 1. Fig. 3 is a sectional view of the casting forming the body of the mill, the rolls and spective view of the bearing-block holder. Fig. 5 is a perspective view, enlarged, of one of the bearing-blocks in whichl the axle of the roll revolves; and Figs; 6 and 7 are a front and rear view, respectively, of one of the rolls.

Referring to the accompanying drawings, the numeral lindicates a casting which forms the body of the mill and which comprises an outer circumferential trough 2 and an ore-receiving chamber 3, a wall or rim 4 separating the trough from the chamber. The bottom of the ore-chamber 3 is highest at its center,

at which point a downwardly-projecting hub 5 is formed. The bottom inclines downward from this point to within a suitable distance of the wall 4:, where it is formed into a circumferential depression 6, which forms a bed for a circular die 7, having grinding-faces 8 and 9, which lie at an obtuse angle to each other. The circular die` is removable and may be replaced by a new one whenworn out.

The upper portion of the wall 4; is outwardly flared, as shown at l0, and this flared portion is provided with a plurality of screen-openings, preferably nine, in which are fitted screens ll of any desired mesh. The upper portion of the outer wall of the trough 2 is alsov ared outwardly, as shown at 12, and the bottom of the trough inclines downwardly on each side to a chute 13, which is diametrioally opposite to the highest point ofthe said bottom, and a hopper 1()A is located on the flared wall 10 at a point diametrically opposite to the chute 13.

The body 1 of the mill is firmly secured to a suitable foundation 14;, which, as illustrated in the drawings, is made up of heavy timbers, to'which vthe body is bolted, the bolts passing through ears l5, which are formed integral with the outer periphery of the body. A shaft 16, which is journaled in a bearing 17, secured to the foundation, passes up through the hub 5 and has keyed upon its upper end what I term a bearing-block holder 18, which, as shown in Figs. l and Li, comprises a central hub portion from which project three wings 19, which are equidistant and at a slight tangent to the axial center of the holder 18. Each of these wings is formed with a verticallyother parts being removed. Fig. 4 is a perl disposed chamber 20, and each side of each :hamber is provided with vertical grooves 21, which extend from the top to within a short distance of the bottom of the chamber. A rectangular block 22, having a horizontal bore or bearing 23, is housed in each of the chambers 20, and the blocks are provided on each side with tongues or ribs 24, which lie within the grooves 21. These tongues are a part of vertical plates or extensions which are located at the front and rear of the block and which are connected by a web 25. An oil-hole 26 extends through the web to the bearing 23, and a second hole 27 extends from the bearing through the bottom of the block. In the bearing of each block is journaled the shaft 28 of a roll 29, and the shaft and roll are preferably formed integral, though the roll may be separate from the shaft and keyed thereto, if desired. The rolls are of the form shown most clearly in Fig. 2, their peripheries being stepped, so as to form a shoulder 30. A shoe 31, having grinding-faces 32 and 33 which coincide with the faces 8 and 9 of the circular die 7, is slipped upon each roll so as to lie against the shoulder 30 and is retained upon the roll by bolts 34, which pass through the end faces of the shoe and through the roll and are secured with nuts which are threaded to their rear ends. Upon each side of the wings is secured averticallydisposed rod 35, the upper ends of which are threaded, and a cross-bar 36, having holes which register with the rods, is slipped upon the said rods, so as to lie above the top of the chamber 20. An expansion-spring 37 is interposed between the web of the block 22 and the cross-bar 36, and the bar is held upon the spring by nuts, which are screwed upon the ends of the rods and against the upper side of the bars. A yielding pressure is thus exerted upon the block, which will prevent undue movement of the same and which will cushion its recoil as it is thrown up by the material beneath the roll. The blocks 22 are limited to a true vertical movement by the tongues 24, which iit in the grooves 21, and the faces of the roll are thus always exactly parallel with the faces of the circular die 7. A circular shield 38 rests upon the top of the flared wall and is held in place by projecting lugs 39. This shield incloses the rollers and holder and receives the splash from the ore.

The bottom of each chamber in the wings of the holder has a downward incline from the front Vrearwardly to the hub of the holder, where it is provided with a hole 40. Immediately beneath these holes is an oil-cup 41, which is formed on the bottom of the mill and surrounds the shaft 16, to which this holder 18 is keyed. Thus the lubricant which is introduced at the holes 26 of the blocks 22 will pass into the bearing 23 and lubricate the shaft 28 of the roll, after which the excess quantity will pass through the hole 27 in the lower side of the bearing and thence into the chamber 20, the inclined iioor of which will convey it to the rear, where it will pass through the hole 40 into the cup 41, where itwill serve to lubricate the vertical shaft 16.

Near the lower end of the shaft 16 is keyed a beveled gear-wheel 42, in mesh with a pinion 43 on a driving-shaft 44, having a pulley which is connected with any suitable source of power.

The hub 5 of the mill is babbitted, as shown', the babbitt extending down to the hub of the beveled gear 42, and between these hubs a series of packing-rings 45 may be interposed.

As previously stated, the wings 19 of the holder 18 are at a slight tangent to its axial center, and the shafts 28 therefore will also beat a tangent. This will cause the front face of the rolls so to contact with the corresponding face of the die 7 that a graduallyincreasing space will occur, beginning at the point of contact of the shoe with the die and extending outward in the direction of the rotation of the holder, as shown at w, Fig. 1. This will enable the ore to more easily feed in between the end face of the roll and the corresponding face of the die.

The operation of the improved mill is as follows: Ore from the crusher is fed into the hopper 10A and thence into the mill, a suitable amount of water being supplied. The holder carrying the rolls is revolved in the direction of the arrow, Fig. 1, through the medium of the beveled gear-wheel 42 and pinion 43, and the rolls pass successively over the ore, crushing it and spreading it out, so as to form a bed. The centrifugal force exerted upon the rolls will cause them to slide outward in their bearings, and their end faces will contact with the corresponding face of the die 7 with sufH- cient fo'rce to thoroughly crush the ore between them. The rolls meantime rise and fall to accommodate themselves to the varying depths of the ore-bed or when passing over hard lumps of ore, the bearing-blocks 22 limiting them to an exact vertical movement, which keeps their faces parallel with the faces of the die, thus causing a thorough and even reduction of the ore. As the ore is crushed and mixed with water, the action of the rolls will cause it to splash against the screens 11, when the ner particles will pass through and fall into the trough 2, whence they are conveyed to the chute 13 and delivered to a concentrating-table, or jig, or classifier, as the case may be. The coarser particles will drop back into the mill, and the splash caught by the shield 38 will drop down over the screens and pass 'through or back into the mill, according as they are coarse or fine.

From the foregoing it will be seen that my improved mill is simple in construction, practical in operation, and thoroughly adapted to the uses forwhich it is intended.

Having fully described my invention, what IOO I claim as new, and desire to secure by Letters Patent, is-

In an ore-mili; a roll-support, comprising a @entrai huh having wings which extend tangentialiy therefrom; and which are recessed to form guideyvays, the bottoms of which ineline downwardly toward the hubs, and are apertured-adjaoent thereto, While their sides have vertical grooves formed therein; hearingbloeks located in the-guideways, each having a horizontal bore, tongues which fit in the vertical grooves, and oil-holes, one of which extends through the top of the block into the bore, while the other extends from the bore through the bottom of the block and communicates with the guideway of the support;

rolls having shafts which are journaled in the bore of the block, the said rolls having shoes with two grinding-faces at an angle to each other, in combination with a chamber having a central bore which is surrounded by an oilcup, an annular die having faces which Coineide with the faces of the rolls, and a shaft extending through the said bore, to which the support is keyed, and means for revolving the shaft and support, substantially as shown.

In testimony whereof I affix my signature in presence of twowitnesses.

WILLIAM E. WILD. `Witnessesz G. SARGENT ELLIOTT, BEssIE THOMPSON. 

